Son of Captain Johan (John) Jacob Seybert (1717–1758) & Maria Elisabetha Theiss (1721–1758) Seybert.

Married Rachel Trail in 1772.

They were the parents of:
~ Elizabeth Seybert (1773–1832)
~ Jacob Seybert (1776–1857)
~ James Seybert (1778–1842)
~ Rachel Seybert (1780–1820)
~ Margaret Seybert (1783– )
~ Anna Mary Seybert (1785–1861)
~ Henry Seybert (1787– )
~ Cassandra Seybert (1789– )
~ William Seybert (1791–1814)
~ George Seybert (1794–1845)

SOURCE:
Family Trees & other data -- Ancestry.com

==========================
Data below from:
Contributor: P.BergSmithLukBud (49645793)

From book Seiberts of Saarland Pennsylvania and West Virginia, pg 35

Jacob Seibert (name changed to Seybert) b cl71?7 Sötern d Apr 28-1758 Fort Seybert, W Va (then Va) m Feb 26-1739 (Mary) Elizabeth Theiss b Jun 29-1721 Grünbach d Apr 28-1758 - killed by Indians

1. Nicholas Seybert b cl?41 d 1813, single
2. Henry Seybert b Nov 30-1743 d Oct 10-1795 m cl772 Rachel Trail
a. Elizabeth Seybert b 1773 m 1798 Abraham Gum
b. Jacob Seybert b 1776 d Mar 30-1857 m Mar 5-1798 Mary Gum 1778 d Oct 5-1861
c. James Seybert b 1778 m May 30-1799 Ruth Jones
d. Rachel Seybert b 1780 m John Jones
e. Margaret Seybert b 1783 m James Janes
f. Anna Seybert b 1785 m Gum
g. Henry Seybert b I787 ml Jul11-1809 Sarah Gum m2 Feb 5-1812 Edith
h. Cassandra Seybert b 1789, single
i. William Seybert b 1791 d 1814 Norfolk VA i n service
j. George Seybert b 179^ m Mantz
3. Margaret Seybert b cl746 m William Janes d 1801
a. William Janes
b. Henry Janes
c. John Janes
d. Edward Janes
e. Elinor Janes
f. Elizabeth Janes g. Margaret Janes
4. Catharine Seybert b cl748
5. George Seybert b cl750 ml Jan 21-1781 Mary Shepherd m2 1791 Mary Pickle
a. Leah Seybert b 1783 m May 26-1815 Christian Rexrode
b. Sarah Seybert b May 12-1784 d Jul5-1882 m Jan 24-1818 Jacob Wimer b Mar 5-1783 d Jul 26-I876
c. Elizabeth Seybert b 1786 d 1844 m Henry Arbogast
d. Catharine Seybert b 1787 d 1875 m Feb 26-1818 James Trimble b Jan 3-1795 d Feb 21-1863
6. Elizabeth Seybert b cl?53 m Henry Janes